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dc.contributor.authorBallester, Carlos
dc.contributor.authorCastel, Juan R. 
dc.contributor.authorIntrigliolo, Diego S.
dc.contributor.authorCastel, Juan R. 
dc.contributor.authorTesti, Luca
dc.contributor.editorSebastiani, L Tognetti, R Motisi, A.
dc.identifier.citationBallE., C., Castel, J., Intrigliolo, D.S., Castel, J.R., Testi, L. (2012). Sap Flow Measurements to Assess Regulated Deficit Irrigation Strategies on Citrus Trees. Viii International Symposium on Sap Flow, 951, 71-78.
dc.identifier.issn0567-7572; 978-90-66053-58-8
dc.description.abstractTranspiration of well watered (C) and regulated deficit irrigated (RDI) trees was determined by means of the compensation heat pulse method during 2009 and 2010 in commercial citrus groves of 'Clementina de Nules' (CN) and 'Navel Lane Late' (NLL). In both species, sap flow (SF) was measured in two trees per treatment instrumented with two gauges per tree. CN trees were equipped with two different types of gauges (type1 shorter than type2) determining heat velocity from crossing time at four different xylem depths according to Green et al. (2003). In NLL oranges, all the gauges were identical and the data were processed according to the compensation heat pulse + calibrated average gradient (CAG) method (Testi and Villalobos, 2009). Plant water status was determined by midday stem water potential measurements (psi(stem)). Results showed that the absolute SF values, and especially those from type2 gauges in CN, clearly underestimated tree water use. Tree to tree variability registered in CN (CV=0.09) was lower than in NLL (CV=0.17) which also showed a 17% of within tree variability. The average nocturnal-to-diurnal sap flow ratio was between 7% and 13%. The evolution of relative SF (e. g. SFRDI/SFC) was in agreement with differences in psi(stem) (r(2)=0.78 in CN and 0.84 in NLL). This SF ratio showed the expected decreasing trend during the water restriction period and the recovery when irrigation was reestablished to normal dose. Overall, the results show that sap flow sensors can detect plant water stress but they also highlight some of the problems for accurately measuring transpiration.
dc.titleSap Flow Measurements to Assess Regulated Deficit Irrigation Strategies on Citrus Trees
dc.title.alternativeActa Horticulturae
dc.authorAddressInstituto Valenciano de Investigaciones Agrarias (IVIA), Carretera CV-315, Km. 10’7, 46113 Moncada (Valencia), Españaes
dc.entidadIVIACentro para el Desarrollo de la Agricultura Sostenible
dc.entidadIVIAServicio de Tecnología del Riego
dc.journal.titleViii International Symposium on Sap Flow

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